Cisco EF4116 Hardware Installation And Maintenance Manual page 66

Making Network Connections
BRI Interface Port Pinout
The BRI interface port pinout is shown in Table 3-2.
Table 3-2
8 Pin
3
4
5
6
1. Pins 1, 2, 7, and 8 are not used.
2. TE refers to terminal terminating layer 1 aspects of TE1, TA, and NT2 functional groups.
3. NT refers to network terminating layer 1 aspects of NT1 and NT2 functional groups.
Caution
connector only and not to any other RJ-45 connector.
Testing the BRI Interface
An external loopback RJ-45 connector, useful for isolating hardware problems on an individual BRI
port, can be constructed as follows:
Step 1
Step 2
Step 3
Note
With the loopback RJ-45 connector plug installed in a BRI port, use the test interface command to
determine that the hardware is functioning correctly.
BRI Network Processor Module LED Indications
When on, the multiport BRI network processor module status LEDs indicate a Layer 1 connection
on the corresponding port. When not on, the LEDs indicate that the link is not established on the
corresponding port.
BRI Network Processor Module Independent of Host
The Cisco Systems Basic Rate Interface (BRI) network processor module is a processor/interface
card assembly for use within a range of data communication (gateway and router) chassis supplied
by Cisco Systems throughout Europe. The BRI module is a self-contained product that provides all
of the hardware necessary to allow connection of Cisco Systems' chassis to either four or eight
Basic Access Integrated Switched Digital Networks (ISDN), each at the S reference point. The
ISDN usage is restricted to the point-to-point mode only.
3-8 Cisco 4000 Series Hardware Installation and Maintenance
BRI Port Pinout (RJ-45)
1 2
TE
Transmit
Receive
Receive
Transmit
To prevent damage to the system, make certain you connect the BRI cable to the BRI
Connect Pin 3 to Pin 4. (See Figure 3-7 and Figure 3-8.)
Connect Pin 5 to Pin 6.
Connect a 50-ohm resistor across Pin 3 and Pin 5.
Pins 1, 2, 7, and 8 are not connected.
3
NT Polarity
Receive +
Transmit +
Transmit –
Receive –